Grain silos were damaged during night strikes by Russian drones in one of the Ukrainian ports on the Danube, Oleg Kiper, the Ukrainian governor of the Odesa region, said on Wednesday, Reuters reports.

“Last night, Russian terrorists attacked Odesa region twice with drones. The main target is port and grain infrastructure in the south of the region,” Kiper wrote on the Telegram messaging app.

Ukraine’s air force said on Wednesday morning that a large group of Russian military drones had arrived at the mouth of the Danube River and headed for the river port of Izmail near the border with Romania.

Users of social networks reported that they heard how anti-aircraft systems were activated in the area of ​​the Danube ports of Izmail and Reni.

Oleg Kiper asked residents of the Izmail district to take cover around 1:30 a.m., and an hour later canceled the raid notification.

Ukrainian ports on the Danube accounted for about a quarter of grain exports before Russia pulled out of a UN-backed deal to ensure safe passage of Ukrainian grain exports through the Black Sea. From then on, they became the main exit route, with grain being transported by barge to the Black Sea port of Constanta for onward shipment.

Earlier this month, Russia attacked Izmail, Ukraine’s main inland port, causing world food prices to skyrocket. Drone strikes destroyed buildings at the port and halted ships preparing to arrive there to load Ukrainian grain, defying the de facto blockade that Russia reimposed in mid-July.